Crossword Genius

Evidence perhaps of defective heating in sleeping area and rodents (7)

Ross

I believe the answer is:

dormice

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'rodents' is the definition.
(dormouse is a kind of rodent)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for dormice that I've seen before include "creatures" , "For these heavy sleepers" , "Furry animals" , "Little hibernating rodents" , "Small field rodents" .)

I've seen this clue in The Telegraph.
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